edwards



F. E. EDWARDS.

FUEL FEED SYSTEM. APPLICATION msn FEB.y le, 591s.

Pntoned lum-f l?, HHS,

Z SHEETS-*SHEET l.

F. E. EDWARDS.

FUEL FEES SYSTEM.

wfmmrm FILED Fa. ls. 19m.

2 SHEETS-'SHEET 2.

sec

OF ILLINOIS.

' Patented June 17, 11919.

l.application led February 16, 1918. Serial No. 21?,70L

To all whom t may concern.' e it known that I, FRANCIS EDWIN DwARDs, acitizen residing at Crystal Lake,

lc-Henry and State of vented a certain new Ament in Fuel-Feed Systems,of vvhich the following is a full, clear, concise, and exact referencebeing had tothe accompanying drawingsforming a part of thisspecification.'

' y invention lrelates tems for automobiles and he present invention isin the county of Illinois, have inand useful' Improveto fuel feed systhelike.

same genral nature set out in my applica- 204,484, filed November 30thIn that application I have set outthe neral advantages of my priorv fuelgravity 1e essential improvement basis of the present inventionemployment of plication of the pumping impulses of the column of airmeans of a' float controlled vent of the pumping chamber.

In the accompanying drawings in Which I have illustrated one embodimentof my inventionN 4 iFigure 1 is an elevational View, partly tional andpartly diagrammatic or' an embodiment of my invention;

Fig. 2 is a vertical cross section of the pumping chamber;

1 ig. 3 is a plan view of the same;

Fig. 4 is a fragmentary view of a modilication showing the floatcontrolling the air vent only and Fig. 5 is a vertical cross sectionsimilar to Fig. 2 of a modification,

In Fig. l I have illustrated my invention as adapted to a system forsupplying liquid fueLfrom the main tank l to the float chamof aninternal It is to be understood invention may be employed 'for'.

feeding lubricating oil to a caring or for other purposes, as will beapparent from the following specification.

I provide a pumping chamber 4, the incombusti on engine.

terior of which conununicates by Way of a a tube 5 of relatively smalldiameter with a ycylinder 6. The cylinder. necting tube containingchamber which, by means of the piston 7 fitting in the cylinder 6, isadapted to receive pumping impulses of alternate compression andrarefaction due to the reciprocation of the piston 7. The piston 7 isconnected by means of a pitman 8 to an eccentric 9 driven by a shaft 10.10 is preferably connected to of the engine or i will insure operationof the piston when the engine is running. he pump cylinder 6 isconnected by a suitable bracket 11 to a frame member l2 of theautomobile. It will be noted `that the cylinder 6 is provided with acylinder head 13 and that no valves`are employed in this cylinder orhead.

he pumping chamber 4 is an integral boss 14 adapted outlet check valve 1provided with to house the 5, this valve discharring through a pipe ortube 16 to the float chamber of the carbureter.

`he pumping chamber 4- is provided with an inlet valve 17 which isadapted to seat on a plug member 18 threaded axially into of the floatchamber. threaded plug 18 is adapted to support a suitable screen 19 anda cage or housing 20, the inlet of which is connected by way of a pipeor tube 2l with the main fuel supply tank or reservoir l. he top of thepumping chamber 4- is closed off by a tight cover 22 which, in thiscase, is provided with an extending bracket for connecting the same tothe bottom of the float chamber 3 of' the carbureter. t

he cover member 22 has an axial opening in which is threaded a valveseat member 25 forming a suitable vent for the interior of the pumpingchamber 4. he vent or plug member 25 is covered -by a suitable cage orhousing perforated with a number of small openings 27, permitting accessto 'the atmosphere.

vertical valvestem 28, having a needle valve 29 at its upper end,cooperates With the seat in the plug member 2.3 to close oli the ventwhen the needle valve is raised.

level controlled member, in tl' 11S 05.5? a. Heat 30, 1s connected bysuitable operating ILLINOIS, Assrelvoa To sTaoMBERG ,.ILLINOIS, A.CORPORATION Y FUEL-FEED SYSTEM.

M Specification of Letters Patent.

' that When ".'float 30 Will rise, 29 andopening the vent.

levers 21v4 to needle valve Iof the `valve stem 28 is guided in a cage31 and is of such length that when t`he vent isopen the lower end o thestem ivill engage the inlet check valve 17 and hold the same upon itsseat. The operation of the system thus far described is as follows-LAssuming that the main supply tank 1 is filled with gasolene The loweren I and that the engine is turned over the piston 1 quired level,whereupon the fuel Within this chamber the point ing pumping imp 7 Willbe reciprocated in the cylinder 6, caus ulses inthe column of air andthe insideaof the pumping lses quickly in the tube 5 chamber 4. Thesuction impu raiseliquid fuel through the pipe 21 and the check valve 17to the pumping chamber 4. The check valve 17 is free to operate as thefloat 30 is in the lower position and the needle valve 29 is raised toclose the vent. As soon as liquid fuel is contained Within the pumping cthrough the outlet check valve 15 ,into the bottom of the carbilreterlfloat chamber 3 until said lioat chamber 'is filled to the refioatcontrol valve in the-float chamber 3 shuts oil' the admission of furtherliquid fuel by .Way of the tube 16. Further operation of-thepumpingoperate upon the-check valve 17. Hf'ivvever1 the check valve 17.,as shown in tively cuts od' Fig. 2, posiJ of to the umpingjchamber untilthe level of of releasing the check valve 17. In case the .pumpingchamber 4t is' placed below the level ofthe float chamber 3 of thecarbureter, thereivould be no'tendency for the fuel in thepumpingchamber to dis-- charge by gravity to if the pumping off from thepumping chamber the apparatus would become inoperative after the ventswere open. To guard against. this eontinl geney the vent E25 is madesmall enough not to give complete relief of the pumping im pulses, sothat villen this vent is slightly open the compression in the column' ofair Wi be of sufficient force within the pumping chamber to causedischarge of the liquid' fuel from the pumping chamber to the carbureterfloat chamber 3 above it. t will `be noted that the valve 29 is arrangedto open a given point thev hamber 4: it will be discharged further fuell has droppe'dto the float chamber and4 impulses were entirely cutvhaving an liquid to be pumped,-a substantially'closed inwardly so thatcompression impulses tend to close the valve when it is but a minutedistance ofi' of its seat, but suction impulses tendto open it.y 4ThisWill tend to trap a sufficient amount of pressure Within` the pumpingchamber to overcome the head of the column of liquid between the pumpsing chamber and .the float chamber. 1n this form it is more desirable toclose inlet check valve 17 so that only the pressure impulse/,s areoperative during th the level Within the pumping chamber f1' is highenough to cause opening, of the vent, rlhe vent under thisconditionoperates as 'sufficient' relief for the suction impu ses to reventthe'dravving of more A the check valve 17 but permits the pressureimpulses to discharge fuel from the puniping chamber. VVhere the pumpingchamber is placed above the fuel will discharge by outlet check valvethen be great both kinds of In Fig. 5 l in which the vent 34 comprises aing at its upper end into the top of the pumlping chamber il', lower,Wall of thejpu-niping chamber and' communicates with the atmospherethrough the opening Q7 in thecap mem er 26. The upper end of the tube 35provides a valve seat with which the needle valve 3 6 co operates toclose off the vent"from the interior of the chamber'. The needle valve36 is mounted on a bracket 37, ysecured to the pumping impulses.

e time that is fastened in the 'i l top of the float 38.l The inletvalve17 is eccentricallydisposed in the chamber 4.

y The operation f the form shown in Fig. 5 is substantiallyy the same asdescribed in connectionivvith the previous figure.

It is to be noted that any rise or average pressure condition of the aircham-4 ber constituting the pipe 5 and cylinder 6 with respect toatmosphere, does not interfere with the operation o thesystem, muchfaswill' be established Within said air chamber by the leakage past thepiston 6, which operates as a breather. ments heretofore, l find thattinct advantage in that the piston need be'made to lit with greataccuracy,vand

have also operatedl the system With-a minute- In fact, in my experi-Athis is a dis-jj ina y fall inthe inasthe general atmospheric conditionsi izo breathing hole in theside Walls of the air chamber. l l

I do not intend' to be limited to the' details of construction shownandfdescribed except as such' detailsare speciiedin-the appendedclaims.,

Y 1 claim: u y 1. Incombination, a pumping chamber inlet valve' and anoutlet valve for 'pumping chamber,

(communicating with the top of said pumping chamber, one wall of saidair chamber being movable to produce compressionsand rarefactions insaid column of air, openingr in the upper part of said pumping chamber,and a level controlled valve in said pumping chamber governing saidvent.

n combination, a pumpingchamber having an inlet valve and an outletvalve for liquid'to be pumped, a substantially closed air chamberinclosing a bod)7 of air and communicating with the top of saidl pumpingchamber, a piston forming a. movable Wall of said chamber, said pistonhaving means governed by the engine to producel compres- `sions andrarefactions in said column ofair, a float in said pumping chamber, avent in the upper part of said pumping chamber, and a valve for the ventcontrolled by said float.

3. In combination, a pumping chamber having inlet and outlet valves forpumping' liquid fuel or the like, a substantially closed air chamber,inclosing a body of air communicating with the upper part of the acarbureter lioat cham er communicating with, the outlet valve of thepumping chamber, said air chamber comprising a movable piston forproducing compressions and rarefactlons in the body of air, and meansfor operating Said piston from the motion of the englne, said pumpingchamber being below the level of the carbureter float chamber.

l. In combination, a pumping chamber having inlet and outlet valves, acarbureter float chamber communicating with the outlet valve, said floatchamber being above the level of the' pumping chamber, an air chambercommunicating with the top of the pumping chamber, said air chamberhaving as one wall thereof a piston movable in a cylinder, and a ventgoverned by the level 4and rarefactions in the body of air of the liquidin the pumping chamber at the top of said pumping chamber.

'n combination, a liquid pumping chamber having inlet and outlet valves,an air chamber communicating with the top the pumping chamber, .said airchamber having a movable Wall for producing compressions andrareiactions of air in said air chamber, a vent in the top of saidpumping chamber., a valve governing said vent, and level controlledmeans governing said vent controlling valve and the inlet valve oi' thepumping chamber.

In combination, a pumping chamber having inlet and outlet valves, areceiving chamber comnuniicating with the outlet valve of the pumpingchamber, said receiving chamber having means governing the discharge ofliquid from the pumping chanr ber to the receiving chamber, an airchamer con'imunicating with theA top o1 the pumping chamber, said airchamber having a movable Wall .For producing compressions in said an'chamber, and mea-ns within the pumping chaniber controlling-"thcapplication of the pumping impulses to the liquid in said pumpingchamber, said pumping chamber being below 'the level of chamber.

7. In combination, a liquid pumping chamber having inlet and outletvalves, an air chamber communicating with the pumping chamber, said airchamber having a movable wall for producing compression and rarefactionsof air in said air chamber and a float in said chamber, said floathaving means yfor closingl the inlet valve when the level in thepun'lping chamber risesI above a predetermined level.

In Witness whereof I hereunto subscribe my name this 14th day oilFebruary, A. D.

F tANCl'S EDWIN EDWARDS.

said receiving i

